As for the personal contribution of Zarathustra to the invention or revalorization of these religious conceptions, the opinions of Iranianists differ and tend to be mutually exclusive. Essentially, it is a matter of two historiographic points of view. According to the one, Zarathustra is a historical personage, a reformer of the traditional ethnic religion, that is, the religion that was shared by the Indo-Iranians in the second millennium B.C. According to the other, the religion of Zarathustra represents only one aspect of the Iranian religion, i.e., Mazdaism, whose center is the worship of
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